NiCo2O4@MnMoO4 core–shell flowers for high performance supercapacitors

Abstract

Hierarchical NiCo₂O₄@MnMoO₄ core–shell nanomaterial on nickel foam was designed via a facile hydrothermal method. A possible growth mechanism of the MnMoO₄ is in which the molybdenum acid radical captures part manganese ions of the MnMoO₄ nanoflowers. When regarded as binder-free electrodes for supercapacitors (SCs), such special NiCo₂O₄@MnMoO₄ core–shell hybrid electrodes exhibit ultra-high specific capacitances several times larger than a pristine NiCo₂O₄ electrode. The electrodes possess high specific capacitance of 1118 F g⁻¹ at a current density of 1 A g⁻¹ and excellent cycling stability (5000 cycles). This remarkable electrochemical performance is ascribed to the effective combination of two electroactive materials and the rational array configuration.